CZ7497A3 - Process of improving metal parts, radioactive contaminated with uranium - Google Patents

Abstract

The invention concerns a method of reprocessing metal parts contaminated with uranium. The metal parts are smelted to form a melt and slag and U235-depleted uranium is mixed with the metal parts, the melt and/or the slag. It is envisaged that the U235-depleted uranium should be added in the form of uranium glass.

Description

(57)

In a method of recovering metal parts that are contaminated with radioactive uranium, the metal parts are melted to form a melt and slag. U 235 depleted uranium is admixed to the metal parts, melt and / or slag, and U 235 depleted uranium is admixed in the form of uranium glass.

CZ 74-97 A3 py

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During the removal of the movable part, they are wiped radioactively tared with uranium, the metal parts melting to form a melt and slag, and uranium depleted in U 235 is admixed to these metal parts and / or the non-solidified slag. In the prior art, the radiation and straightness of the cores during operation of the cores has resulted in the evaluation of the so-called "Gr ^3" . tSV 'm τ * ·' «w -U. · W d cip-i 73 vMlou o ^v weir. Dead metal scrap to be removed or. It is common for this scrap to be subjected to melting decontamination. Even if the metal which the radioactive footbridges are causing may be found pd: more than 3 etruscan

kovo v parts why es- at drace binds into forming í se with droppings- make up the taverine is MŠ ob jea ) no ž slag volume, st áva what nej- .ioakt substances.

containing nuclear special safety precautions, curl * ♦ · t r

CJ <5 «- ´ '- A“ »nuclear fuel contamination line - which- contains rupMklad

f Si c. Only 'Q * 7 OV * <can be used for decontamination

If the ICC kg of slag can be expected more than 3 grams in 235. Since p 'i melting "for Cesu uranium passes into the slag and there zkoncentrovává _t zmrevidla this Mass values for steps if you take no further action.

Exceeding the lower value should be avoided by mixing another slag containing no uranium in the uranium-containing slag. With a sufficiently large quantity of slag, which contains uranium, the uranium concentration to the extent necessary to reduce, lesbytné ^r i smruskv bv bvlo however so large that the amount of slag cy uneconomically zvýšino ..nocovat more with - wi> ». kw ”· ** .a * 7 · - There has also been a new process in uranium renaturation which causes contamination. It is important that the composition of the uraIr ot - k · ς» O Λ *

Λ. w w - Q> - - Uw vas ar o slags not 00 ~ bound, changed to correspond to isotopes of natural uranium. This means that under U 235 in uranium it must not be greater than about C, 7 2,

Uranium, which in its isotopic composition is equal to uranium, does not need to be subjected to the carelessness that applies to uranium

-auerne oalrvo.

(i) it is already known to reduce the isotope model; in the anvil parts, to the stock and / or ν ϋ Ι Ι »1 1 1 1 1 1 1 1 m Si ** v · »π -m 77

WA.-W —X.J.— 'w, -.

at U 23o. the press is obtained when the process is carried out,

With v 27liSkCS. 1 isotope ie 235 corresponds to the proportion of J 235 in natural uranium or is even lower than this.

Until now, it has been customary to mix uranium depleted in the form of “Cn or UACL”. These oxides are used as a powder. Such powder does not, according to experience, distribute evenly in the melt or slag. As a result, the slag sample may not have the required low proportion of U 235. Even if the powder is admixed, it becomes 0 w V -v 7 η o “λ

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The invention has as its primary role of state AUP • WT 'xn Z »· *»: #, ^Z · 1

-5 O Γ> r * '- -O r \ ΛΤ CV »vT O' r? - <7 mr \ «η o * - Ί ^: O-x 'O -4--1-- T r \ * · o _

OUv> --Vy - «-. V v '' w w. j <n_ ^- mined by radioactive uranium, using it:

- y · ».-» ♦ y - -><- v * p <3 Q ¹ £> ^Ί y 9 <a '* 2 7 * h ν' c ζ * 1 T y. Q o? - p · * q ·· - the slag can easily be handled and destroyed.

The task is an idol in publicity:

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Incorporated in the dark, the uranium is hardened by its glass.

235 is framed in the form of uranovese a.oea-1 me vyncuy that uranium ocnuzeϊ Λ O - »ύ- \ - r> λ. -y Vx —- the conjugation of the ninv can mix homogeneous with uranium, which causes -tamination. The same advantage is obtained when ur:

: o _ _ _ _ _ _ _ _ which contains uranium which is nu-ΤΠ Γ ϋ 235, pulp to unprocessed scrap metal and / or melt and / or still liquid slag when it is already separated from the other melt.

Due to the homogeneous deposition and binding of uranium from the uranium glass, the advantage is achieved that the composition of the uranium isotopes in the slag is also conversational. There are no individual zones in the slag that find too high a concentration of U 235 · As a result, all the slag does not need to be treated as nuclear waste, some of its uranium content

A u m. - η q θ.j $ ss ~ ko ^T j to work closer to vfhodou ^ e / .r.oáuše Mar. peck and / ς more narrowly about G d C '1'3 and second C t «submission isotors of natural uranium. The strips are coated with glass uranium krurium, uranium glass beads, uranium glass rods and / or uranium glass pieces. This part of the uranium glass can be made! in ways and legs to stockpile.

lar'Example v - r · l · - ~ 4 · η · ηΊ Λ žernove. It is up to the tons for the glass to have a low-viscosity glass at the melting point of the metal of the metal parts. This has the advantage that improved slag liquefaction is achieved, irrespective of the proportion of uranium, in the glass. This leads to an even better distinction in the mixing of uranium.

w fy - * w · f * uci-ac. The resin is matured in an alkali metal glass (SiCl 2). such sketches may contain 51 m of uranium. The alkali metal Cuider in nar_i -y · ··· «τ

- Contains an isotope fraction of 255 less than 0,7 γ, if it is about 0,2?. With sufficient addition in Russia, a proportion of isotope ϋ 235 is achieved, which is so small that the slag can be destroyed without any problems. For example, if the proportion of the isotope V 2o5 of the uranium which caused the contamination is 5.1 / 3, it is obtained by means of uranium glass containing a proportion of isotope U 235 of 0.25 in the slag of the proportion of isotope U 253 of less than 0 , 7 y.

The carp-ad is mixed with uranium glass containing less than 50% uranium. ejména ^with little uranium glass contains less than 40 characterized, for example between 5 characterized SZ T9 yz ιΊΓΗ'ΊΙΙ _w illl TO 3 3 2 XO c ^'R LCL' Θ * HGXŠÍ when the proportion of uranium in the glass is less. If the proportion of uranium in the uranium glass is significantly less than 30, a slag containing uranium is formed whose density is considerably less than that of the iron-containing melt. The slag floats on the melt and can then be particularly easily separated from the melt, for example to collect. The density of the uranium glass with an uranium content of, for example, IC 1 is 3.5 J / cm 2. Despite the uranium content of 50 y, the density of uranium glass is 7.7 g / czk. The iron density is about 7.3 g / cm &^lt; 3 &gt;

An embodiment of the invention is further explained by the disease of one example that many times can be refined according to the invention.

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The melt decontamination of contaminated metal parts created 5,4 kg of slag, which corresponds to ·

255 and 1. 1 g y

3.29 or · 2for the isotope part renaturation, the U 235 isotope fraction is reduced from 3.03;

the uranium isotor was born

This proportion is n: in natural uranium. In order to achieve the desired reduction, uranium depleted uranium or uranium depleted uranium 235 is used. The uranium isotope 235 of this depleted uranium is, for example, 1.2. This depleted uranium requires 620 g in order to obtain slag with an uranium isotope of 233 C, 5%.

Despite the process according to the invention, the depleted uranium is treated in the form of uranium glass. This uranium group contains nsp-tn isotoT

The 235 * is C, 2; 2. se you;: ο · 2: ί porrekter- o about soot

«.- θ Γ0 i i S 3 V 0?

And to the slag, snzzzl so far, that the slag could be easily manipulated, it was using jedmduohýek. free strokes usola0 0U idle in / find;

> O rr Λ ta.

The advantage is that the slag resulting from the decontamination of the melt containing uranium can be easily destroyed. Personnel loads and dust filters with uranium dust are removed as much as possible.

Claims (1)

Ξ T O V J H A S C S Ϊ A method for the recovery of metal parts contaminated with radioactive uranium, wherein the metal parts are melted to form a melt and slag, and wherein uranium depleted in U 235 is admixed with the metal parts and / or the melt and / or not yet slag. characterized in that the uranium depleted in U 235 is fed in the form of uranium glass. the shape of semolina and / or pearls and / or bars and / or pieces. or 2, b according to one of the claims 1, characterized in that the uranium is: at the melting point of the metal, the metal parts are glass Process according to one of Claims 1 to 3, characterized in that the urano is an alkali metal (SiOg) glass. Method according to one of Claims 1 to 4, characterized in that the uranium uranium of the glass is lower than the isotope fraction of C7. * r -r y> ct blow vi ^c * Spisoc sweated though learning f. W Z <3 *** ”V O i loi.o z n ar o nu _ a z o, that fraction